Love boats and sexy submarines: 7 romantic riverside retreats

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Photos:Top 7 Valentine's Day water dates

All you need is love – Couples looking for a water-side adventure this Valentine's Day, can book a ticket to ride on the converted Beatles Yellow Submarine hotel in Liverpool.

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Photos:Top 7 Valentine's Day water dates

Sweet river cruise – You could buy your sweetheart a box of chocolates on February 14. Or you could push the boat out and take them on a chocolate-making course down the river Thames.

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Photos:Top 7 Valentine's Day water dates

Pearl hunters – Adventurous couples may choose a pearl diving expedition in Bahrain on a traditional wooden sailboat -- called a dhow.

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Photos:Top 7 Valentine's Day water dates

Lighthouse love-in – "You can daydream together whilst enjoying magnificent views of the City through diamond-leaded windows," said Victoria Burns, administrator of a thousand-year-long music piece playing from London's only lighthouse.

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Photos:Top 7 Valentine's Day water dates

Arctic adventure – Admire the icy Arctic from the comfort of a steaming sauna on board converted floating hotel, Vulkana.

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Photos:Top 7 Valentine's Day water dates

Picture-perfect Med – Artistic lovebirds can capture the sparkling Mediterranean, which so bewitched Roman general Mark Antony, in a painting course.

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Photos:Top 7 Valentine's Day water dates

Underwater snappers – You don't have to get married, but you can still capture every moment of a tropical Thailand holiday with an underwater photography class.

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Story highlights

This Valentine's Day, ditch the chocolates and try a unique nautical excursion

CNN brings you the top 7 dates for adventurous aquatic-lovers

Includes chocolate-making cruises and pearl diving courses

Beatles fans can stay on converted yellow submarine hotel

Valentine's Day is about spending quality time with that special someone who floats your boat. And what better way to show your love is deeper than the ocean than by treating your sweetheart to a romantic sea-themed excursion?

But if you thought watching sunsets over water was going to cut it, think again. From staying on the Beatles' famous yellow submarine in Liverpool to pearl diving in the Persian Gulf, CNN takes a look at the top seven dates for adventurous aquatic-lovers.

Alan Whatley, former chef at London's prestigious Savoy restaurant, shows guests the fine art of creating sumptuous chocolate desserts -- all while meandering through the south England countryside on a 12 meter wooden vessel.

The 23 meter vessel offers safaris along the dramatic Arctic coastline and boasts a wood-fire sauna, saltwater hot tub and seven-meter diving board for the more adventurous.

When not marveling at the snow-capped views from the comfort of a steaming spa, sweethearts can take part in winter activities, inclduing reindeer-sledding and skiing.

"There's something spiritual about the boat itself," co-owner Erlend Larsson said. "It's had a long life, and many different owners, and all of them have said how safe and calm everybody feels onboard."